Method and device for performing power control in NR V2X

1. A method for performing wireless communication by a first device, the method comprising:

obtaining, by the first device, configuration related to a plurality of bandwidth parts (BWPs),

wherein the plurality of BWPs include a plurality of sidelink BWPs,

measuring, by the first device, a channel busy ratio (CBR) for each of the plurality of sidelink BWPs;

selecting, by the first device, at least one sidelink BWP among the plurality of sidelink BWPs, based on the CBR for the each of the plurality of sidelink BWPs;

determining, by the first device, a highest priority among at least one priority of the at least one sidelink BWP, as a priority of a first carrier comprising the at least one sidelink BWP,

wherein based on the at least one sidelink BWP being activated, sidelink transmission on the at least one sidelink BWP is performed;

allocating, by the first device, transmit power for the first carrier based on the priority of the first carrier; and

performing, by the first device, the sidelink transmission through the at least one sidelink BWP based on the transmit power.

2. The method of claim 1 , wherein the highest priority of sidelink transmission requiring highest transmit power among at least one priority of the sidelink transmission through the at least one sidelink BWP is determined as the priority of the first carrier.

3. The method of claim 1 , wherein the highest priority of sidelink transmission through a preset sidelink BWP among at least one priority of the sidelink transmission through the at least one sidelink BWP is determined as the priority of the first carrier.

4. The method of claim 1 , wherein the highest priority among at least one priority of sidelink transmission through at least one sidelink BWP used for the first device to obtain time or frequency synchronization is determined as the priority of the first carrier.

5. The method of claim 1 , wherein based on a number of the at least one sidelink BWP being two or more, the sidelink transmission through the at least one sidelink BWP overlap in a time domain.

6. The method of claim 1 , wherein the transmit power allocated for the first carrier is less than transmit power required for the sidelink transmission through the at least one sidelink BWP.

7. The method of claim 6 , wherein the transmit power allocated for the first carrier is preferentially allocated for sidelink transmission having a high priority among the sidelink transmission through the at least one sidelink BWP.

8. The method of claim 6 , wherein the transmit power allocated for the first carrier is equally allocated for the sidelink transmission through the at least one sidelink BWP.

9. The method of claim 6 , wherein the transmit power allocated for the first carrier is preferentially allocated for preset sidelink transmission.

10. The method of claim 6 , further comprising:

wherein the transmit power allocated for the first carrier is preferentially allocated for sidelink transmission through a BWP having a high CBR among the sidelink transmission through the at least one sidelink BWP.

11. The method of claim 1 , wherein the first device comprises at least one of a transmission UE, a reception UE, a wireless device, a wireless communication device, a vehicle, a vehicle having an autonomous driving function, a connected car, an unmanned aerial vehicle (UAV), an artificial intelligence (AI) module, a robot, an augmented reality (AR) device, a virtual reality (VR) device, a mixed reality (MR) device, a laptop computer, a digital broadcasting terminal a tablet PC, a smartphone, a wearable device, a hologram device, a public safety device, an MTC device, an IoT device, a medical device, a fintech device, a security device, or an environmental device.

12. A first device for performing wireless communication, the first device comprising:

at least one memory;

at least one transceiver; and

at least one processor to couple the at least one memory and the at least one transceiver, wherein the processor is configured to:

obtain, configuration related to a plurality of bandwidth parts (BWPs),

wherein the plurality of BWPs includes a plurality of sidelink BWPs,

measure, a channel busy ratio (CBR) for each of the plurality of sidelink BWPs;

select, at least one sidelink BWP among the plurality of sidelink BWPs, based on the CBR for the each of the plurality of sidelink BWPs;

determine a highest priority among at least one priority of the at least one sidelink BWP, as a priority of a first carrier comprising the at least one sidelink BWP, wherein based on the at least one sidelink BWP being activated, sidelink transmission on the at least one sidelink BWP is performed;

allocate transmit power for the first carrier based on the priority of the first carrier; and

control the at least one transceiver to perform the sidelink transmission through the at least one sidelink BWP based on the transmit power.